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-rw-r--r--src/libstd/sync/rwlock.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libstd/sync/rwlock.rs b/src/libstd/sync/rwlock.rs
index 5a6bf987fd7..4ca2e282f70 100644
--- a/src/libstd/sync/rwlock.rs
+++ b/src/libstd/sync/rwlock.rs
@@ -253,7 +253,7 @@ impl<T: ?Sized> RwLock<T> {
     /// time.  You should not trust a `false` value for program correctness
     /// without additional synchronization.
     #[inline]
-    #[unstable(feature = "sync_poison")]
+    #[stable(feature = "sync_poison", since = "1.2.0")]
     pub fn is_poisoned(&self) -> bool {
         self.inner.poison.get()
     }